/**
 * Copyright (c) 2011-2019, James Zhan 詹波 (jfinal@126.com).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.jfinal.render;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;

import com.jfinal.kit.StrKit;
import com.jfinal.template.Engine;
import com.mchange.io.FileUtils;

import cn.moceit.util.CopyUtil;

/**
 * TemplateRender
 */
public class TemplateRender extends Render {
	protected static Engine engine;
	private boolean isCopy = false;
	private static final String contentType = "text/html; charset=" + getEncoding();

	static void init(Engine engine) {
		if (engine == null) {
			throw new IllegalArgumentException("engine can not be null");
		}
		TemplateRender.engine = engine;
	}

	public TemplateRender(String view) {
		this.view = view;
	}

	public TemplateRender copy(boolean isCopy) {
		this.isCopy = isCopy;
		return this;

	}

	public String getContentType() {
		return contentType;
	}

	public void render() {
		response.setContentType(getContentType());

		Map<Object, Object> data = new HashMap<Object, Object>();
		for (Enumeration<String> attrs = request.getAttributeNames(); attrs.hasMoreElements();) {
			String attrName = attrs.nextElement();
			data.put(attrName, request.getAttribute(attrName));
		}

		try {
			OutputStream os = response.getOutputStream();
			if (isCopy) {
				File copyFile = new File(CopyUtil.getTplCopyPath(request.getRequestURI()));
				if (!copyFile.getParentFile().exists()) {
					copyFile.getParentFile().mkdirs();
				}
				if (!copyFile.exists()) {
					copyFile.createNewFile();
				}
				FileOutputStream fileOutputStream = new FileOutputStream(copyFile);
				engine.getTemplate(view).render(data, fileOutputStream);
				os.write(FileUtils.getBytes(copyFile));
				os.flush();
				os.close();
			} else {
				engine.getTemplate(view).render(data, os);
			}

		} catch (RuntimeException e) { // 捕获 ByteWriter.close() 抛出的
										// RuntimeException
			Throwable cause = e.getCause();
			if (cause instanceof IOException) { // ClientAbortException、EofException
												// 直接或间接继承自 IOException
				String name = cause.getClass().getSimpleName();
				if ("ClientAbortException".equals(name) || "EofException".equals(name)) {
					return;
				}
			}

			throw e;
		} catch (IOException e) {
			throw new RenderException(e);
		}
	}

	public String toString() {
		return view;
	}
}
